Steel Bit - 10pcs (3.5mm) pkt

A packet of ten 3.5mm twist drill bits for steel. The half-millimetre sizes exist because fixings do not come in round numbers - 3.5mm is the pilot for many self-tappers and the clearance hole where 3mm binds on the screw and 4mm leaves it loose - and they are bought ten at a time for the same reason the 3mm are: bits this slim snap, and a workshop holding one of them stops the moment it goes. Used for pilot holes, tight clearance in sheet and light section, rivet holes, cable cleats, instrument panels and repair work. Hammer action off, moderate speed, punch mark first, and ease the pressure right off as the tip breaks through the far side.