---
product_id: 15184491
title: "Prime-Line U 9517 3-1/2 In. Chrome Plated Back Plate (2 pack)"
brand: "defender security"
price: "€ 12.36"
currency: EUR
in_stock: true
url: https://www.desertcart.es/products/15184491-prime-line-u-9517-3-1-2-in-chrome-plated
store_origin: ES
region: Spain
---

# 3.5-inch diameter precision fit Converts backset between 2-3/8" & 2-3/4" Steel nickel-plated for durability Prime-Line U 9517 3-1/2 In. Chrome Plated Back Plate (2 pack)

**Brand:** defender security
**Price:** € 12.36
**Availability:** ✅ In Stock

## Summary

> ✨ Upgrade your door’s style and function in a snap! 🔧

## Quick Answers

- **What is this?** Prime-Line U 9517 3-1/2 In. Chrome Plated Back Plate (2 pack) by defender security
- **How much does it cost?** € 12.36 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.es](https://www.desertcart.es/products/15184491-prime-line-u-9517-3-1-2-in-chrome-plated)

## Best For

- defender security enthusiasts

## Why This Product

- Trusted defender security brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Easy Installation:** Lightweight 0.32 oz plates install quickly behind your handleset—no hassle, no fuss
- • **Seamless Door Revival:** Covers marred or damaged door surfaces with a sleek chrome finish
- • **Modern Minimalist Design:** Chrome plating adds a polished, professional look to any door setup
- • **Durable Steel Construction:** Nickel-plated alloy steel ensures long-lasting strength and weather resistance
- • **Precision Backset Conversion:** Effortlessly switch between 2-3/8" and 2-3/4" backsets for versatile lock compatibility

## Overview

The Prime-Line U 9517 is a 3-1/2 inch chrome-plated steel back plate designed to cover door imperfections and convert lock backsets between 2-3/8" and 2-3/4". Sold in a convenient 2-pack, it offers weather resistance and a sleek modern finish, perfect for professional-grade door renovations and upgrades.

## Description

Prime-Line U 9517 3-1/2 In. Chrome Plated Back Plate (2 pack)

## Features

- Typically used on 2-1/8 inch bore lock sets
- Converts a 2-3/4 inch to 2-3/8 in
- Steel nickel plated
- Covers marred doors
- Lock sets are not included

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | Defender Security |
| Special Feature | Weather Resistant |
| Lock Type | Rim Lock |
| Item dimensions L x W x H | 0.06 x 3.5 x 3.5 inches |
| Material | Alloy Steel |
| Recommended Uses For Product | Door installation, renovation, or repair |
| Style | Modern |
| Color | Chrome |
| Number of Pieces | 2 |
| Finish Type | Chrome |
| Included Components | Back Plate |
| Shape | Round |
| Item Weight | 9.07 g |
| Control Method | Touch |
| UPC | 049793095176 |
| Model Name | 3-1/2 in. Chrome plated Back Plate (2 pack) |
| Global Trade Identification Number | 00049793095176 |
| Manufacturer | Prime-Line Products |
| Part Number | U 9517 |
| Item Weight | 0.32 ounces |
| Product Dimensions | 0.06 x 3.5 x 3.5 inches |
| Item model number | U 9517 |
| Is Discontinued By Manufacturer | No |
| Size | 3-1/2 in. |
| Finish | Chrome |
| Item Package Quantity | 1 |
| Special Features | Weather Resistant |
| Batteries Included? | No |
| Batteries Required? | No |
| Warranty Description | Goods are warranted against manufacturing defects for 1 year. In no case is Prime-Line responsible for user related damage or damage incurred during installation. Warranty is void if products are subjected to abnormal conditions, misapplication or abuse. |

## Product Details

- **Brand:** Defender Security
- **Special Feature:** Weather Resistant
- **Lock Type:** Rim Lock
- **Item dimensions L x W x H:** 0.06 x 3.5 x 3.5 inches
- **Material:** Alloy Steel

## Images

![Prime-Line U 9517 3-1/2 In. Chrome Plated Back Plate (2 pack) - Image 1](https://m.media-amazon.com/images/I/51KSU22fw1L.jpg)

## Questions & Answers

**Q: How thick is the plate?**
A: The thickness is 3/64" or .046875 or 1.1906mm.

**Q: Will it work with a standard kwikset entry door knob?**
A: Yes, it fits a standard handle that has a 2 1/8" bore hole.

**Q: Is this product good for covering the extra holes left by the large rosette ADA locksets ?**
A: Depending on the size of the hole from the previous rosette, it can be sandwiched between the new rosette and the door itself to cover up holes and marks and allow smaller hardware something to grip when the new set screws are tightened down.

**Q: what is the interior diameter?**
A: ID = 2 1/8 inches

## Frequently Bought Together

- Prime-Line U 9517 3-1/2 In. Chrome Plated Back Plate (2 pack)
- 4pcs Door Reinforcement Plate, Door Handle Fixing Cover Filler Repair Backplate Stainless Steel Door Lock Repair Plate Door Lock Repair kit
- Probrico 10 Pack Keyed Alike Entry Levers, Wave Style Satin Nickel Entry Locksets, Exterior Interior Door Levers with Lock and Same Keys(for Bedroom or Office)

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**Shop now:** [https://www.desertcart.es/products/15184491-prime-line-u-9517-3-1-2-in-chrome-plated](https://www.desertcart.es/products/15184491-prime-line-u-9517-3-1-2-in-chrome-plated)

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*Product available on Desertcart Spain*
*Store origin: ES*
*Last updated: 2026-02-26*