Steel Bit - 10pcs (5mm) pkt

A packet of ten 5mm twist drill bits for steel. Buying this size by the packet is about repetition rather than breakage: 5mm is the clearance for M5 fixings and larger rivets, and the jobs that use it - a run of brackets, a panel of rivets, a length of trunking - want the same hole drilled dozens of times, which blunts a bit steadily even when nothing goes wrong. A blunt bit rubs rather than cuts and work-hardens the steel, so the next bit struggles too. Ten in the drawer means changing early instead of pushing on. Hammer action off, moderate speed, punch mark first, and cutting oil on anything thicker than sheet.