BRADEM 6-Piece Multi-Purpose Drill Bit Set for Men - Countersink, Lathe & Home Improvement Tools (Silver, One Size) | Perfect for DIY Projects, Woodworking & Metalworking

Durable and Resistance: Center drill bit is made of high-speed steel, with an extremely sharp blade, low consumption and durable with impact resistance, wear resistance.60° countersink angle fits all standard centers.Wide Usages: Center drill bits can be used to make conical holes for a lathe center in order to make a starting point for a standard twist drill, designed to the twist drill from walking, as well as for producing center holes in components orWorkpieces with requiring machining between centers.Available for all Kinds of Materials: Metal, Alloy, Copper, Iron, Wood, Aluminum, and so on.Each drill has a double end and is ground with a standard 60 angle# 1 with 4mm body diameter & 1mm drill tip diameter# 2 with 4mm body diameter & 1.5mm drill tip diameter# 3 with 5mm body diameter & 2mm drill tip diameter# 4 with 6mm body diameter & 2.5mm drill tip diameter# 5 with 8mm body diameter & 3mm drill tip diameter# 6 with 12mm body diameter & 5mm drill tip diameterChoose a match type of center drill bits according to the hole type and the straight hole size of the machined parts.The heat treatment hardness of center drill bit is between 63-66HRC appropriate.Wash the rust-proof grease before using the center drill bit, so as to avoid chip sticking on the cutting edge.The surface of work-piece should be smooth to avoid center drill bit being damaged.The center drill bit should achieve the required position accuracy before drilling.1set of 6pcs Center Dril