Features: Made of premium Carbide with high hardness, wear -resistant,not easy to bend and break. Small chip removal resistance, smooth to remove chips and drill holes. Sharper cutting edge can reduce cutting force and improve drilling quality. Strictly symmetrical cutting edge can ensure high efficient working and avoid the deviation in drilling. Can be applied to PCB, SMT, mould, hardware processing, electronic industry, etc. Multiple sizes included in one set to meet different needs. Compact size and stored in a box for easy carry. Specification: Material:Carbide Size: 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm Weight: 160 g / 5.6 oz(approx.) Package list: 1 * white plastic box 10 * 0.5 PCB drill bit 10 * 0.6 PCB drill bit 10 * 0.7 PCB drill bit 10 * 0.8 PCB drill bit 10 * 0.9 PCB drill bit Package List 1Made of premium Carbide with high hardness, wear -resistant,not easy to bend and break. 2Small chip removal resistance, smooth to remove chips and drill holes. 3Sharper cutting edge can reduce cutting force and improve drilling quality. 4Strictly symmetrical cutting edge can ensure high efficient working and avoid the deviation in drilling. 5Can be applied to PCB, SMT, mould, hardware processing, electronic industry, etc.