POZI – Impact Driver Bits – PZ3 – No.3 x 50 (5 pcs)

A 50mm PZ3 impact driver bit sounds straightforward enough, but there is a significant difference between a bit that lasts a morning and one that earns its keep across a full week on site. These PZ3 No.3 x 50mm impact bits are built around a genuinely considered metallurgical approach — not just harder steel, but steel that behaves the right way under impact loading. The torsion zone along the body is designed to absorb the rotational and downward shock that a standard bit simply cannot handle without fatiguing or snapping.

The heat treatment process is worth noting. Bit hardness in the tip is high enough to grip the fastener and drive cleanly, but the body is deliberately softer to flex rather than fracture under heavy load. It sounds counterintuitive, but it is exactly the right approach for impact driving. Anyone who has snapped a cheap bit mid-drive into treated timber or a dense structural section will appreciate why this matters.

Where PZ3 50mm Impact Driver Bits Earn Their Keep

The 50mm length makes these well suited to applications where you need a bit of reach: driving longer decking screws, timber frame fixings, and structural screws through thicker material where a 25mm bit would leave you short. PZ3 is the go-to size for larger Pozidriv fasteners, and you will find it coming up again and again on roofing batten work, fencing, carcassing, and general groundworks joinery. The No.3 drive is a solid fit for screws typically in the M6 and above range, or any Pozidriv head marked with the number 3.

The black phosphate finish does more than look the part. Phosphate coatings provide a degree of corrosion resistance that bare steel cannot, which matters when you are working in wet conditions, storing bits in a van overnight, or driving galvanised fixings where bare metal contact can accelerate surface rust.

Pack of 5 for Day-to-Day Site Use

Five bits per pack makes practical sense for a working driver kit. Keep one in the chuck, a couple in your belt pouch, and spares in the bag. Impact bits do wear, and having a fresh one available mid-job is the difference between finishing on time and hunting around the site van. At this price per pack, they are sensible to stock in quantity — particularly if your work regularly involves high-volume screw driving where bit wear is just part of the job.