Misuyue 8% Cobalt Drill Bits, Metal Drill Bit Set 5mm, HSS M42 Carbide Twist Drill Bit for Metal Stainless Hard Steel Aluminum, Wood Drill Bits (4pcs)

Description

Product Description Misuyue Drill bit set apply for iron, copper, aluminum, stainless steel, wood, plastic, it is recommended to use electric hammer drill bits for concrete, ceramic tiles, cement walls, stones, etc. Please make sure that the drill and the workpiece are stable before use . It is strongly recommended to use a drill press when drilling thick metal. To avoid breaking the drill bit when drilling, please keep the drill bit perpendicular to the workpiece. Please adjust the RPM to the lowest when you start drilling metal. The friction between the drill bit and the workpiece will generate a amount of heat when drilling, it is necessary to use coolant liquid during the drilling process. Important to control the speed Tips: Use an appropriate lubricant to reduce friction and heat build-up. Controlling the speed is very important, recommended speed: 100-800rpm/min . The larger the diameter, the slower the speed required. If the hole is larger than 6mm, first drill a small hole with a 3.2mm-4mm drill bit, and then use a larger drill bit to enlarge the hole. Note : The smaller sizes need to control the force and proceed step by step when drilling holes. Do not drill violently to prevent the drill from breaking. Review: Good quality - Good quality used on SS but I would not use without coolant but no problem on mild steel or cast Review: Did the job - Worked well when first used but went blunt quite quickly but because there was 4 managed too do job bought for