---
title: WERA 851/4 A Bits for Phillips Screws
url: https://octoolhouse.com/product/851-4-a-bits-for-phillips-screws/
date: 2023-04-22T18:41:56+00:00
modified: 2026-10-11T22:59:49+00:00
lang: en_US
---

# WERA 851/4 A Bits for Phillips Screws

Aviation (A) bits are particularly hard bits with a sharp-edged profile which penetrates screw profiles full of paint (such as on fuselage panels) ensuring a dependable transfer of force between the bit and the screw.