> **Source:** Core Electronics is an Australian maker-electronics retailer and manufacturer based in Newcastle, NSW, run by a team of makers and educators. We design and manufacture our own product lines (PiicoDev, CE originals) and are official retailers for iconic maker and industrial brands including Raspberry Pi, Arduino, Adafruit, SparkFun and DFRobot. Orders ship Australia-wide from our Newcastle warehouse. Prices are in AUD and include GST. Pricing, stock and dispatch on this page are generated from the store's live catalog. Full machine-readable index: https://core-electronics.com.au/llms.txt

# 2904 Series Hole Reducer (4mm ID x 14mm OD) - 4 Pack

**Type:** Product page · **SKU:** GB-2904-0004-0014 · **Brand:** [goBilda](https://core-electronics.com.au/brands/gobilda)
**Page:** https://core-electronics.com.au/2904-series-hole-reducer-4mm-id-x-14mm-od-4-pack.html ([markdown](https://core-electronics.com.au/2904-series-hole-reducer-4mm-id-x-14mm-od-4-pack.html.md))

This hole reducer fits in a 14mm hole and reduces the bore to 4mm. The reducer protrudes 1mm into the 14mm hole so that a pair of them can.....

## Pricing

- **Price:** $6.75 (inc GST) — $6.14 AUD, exc GST
- **Quantity discounts:** 10+ $5.83 (exc GST) · 25+ $5.53 (exc GST)

## Availability & dispatch

- Available with a lead time — expect dispatch between Sep 02 and Sep 07.

## How to buy

- **Build a cart:** compose `https://core-electronics.com.au/cart/link?items=GB-2904-0004-0014:1` (comma-separated SKU:qty pairs) and share the link. Opening it shows a confirmation page with live pricing and stock before anything is added to the cart.
- **Verify the cart first:** fetch `https://core-electronics.com.au/cart/link/GB-2904-0004-0014:1.md` for live line prices (inc & exc GST, quantity discounts applied), stock and dispatch estimates, and totals. Append `/to/{AU-postcode}` (or `/to/{country-code}:{postcode}`) before `.md` for delivery options and prices to that destination. Unknown, retired, or out-of-stock SKUs are flagged. (Query form `cart/link.md?items=...` also works but some robots parsers refuse query strings here.)
- **Checkout** is completed on-site and includes a captcha at the payment step. Share the cart link; checkout takes it from there.
- **Search the catalogue:** `https://core-electronics.com.au/search/{query}.md` (URL-encode the query; pages 2-3 at `search/{query}/{page}.md`; `search.md?q=` also works)
- **Payment methods, purchase orders, policies and contact details:** https://core-electronics.com.au/llms.txt
## Description

This hole reducer fits in a 14mm hole and reduces the bore to 4mm. The reducer protrudes 1mm into the 14mm hole so that a pair of them can clad a part with 2.5mm thickness, such as U-Channel or Low-Side U-Channel, and tightly squeeze down on the channel.

### Downloads

- [ STEP File ](https://core-electronics.com.au/attachments/localcontent/2904-0004-0014_4155c51213.zip)

### Specs

| Weight | 2.5g Each |
|---|---|
| Material | Steel |
| Finish | Clear Anodized |

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/G/B/GB-2904-0004-0014-1.jpg)