?Center Drill bit?This center drill is made of high speed steel drill bit & quenching treatment shell designed. High hardness, durable and superior drilling performance, perfect for hinges, handles, drawer slides, woodworking and etc.
?Center Drill Size?Hinge drills come in 7 different sizes: 5/64', 7/64'', 9/64'', 11/64'', 13/64'', 5mm and 1/4" With 1 Hex key & 7 replacement drill bits
?Countersink Drill Bit?The countersink drill bit is made of high carbon steel material with titanium nitrate coating. High hardness, durable and offer superior cutting power. Perfect for Granite, tile, glass, quartize, ceramic, vitrified brick etc. Suitable for bench drill, hand drill and conventional electric drill.
?Countersink Drill Size?7different sizes: 3mm(Dia) x 60mm(L), 4mm (Dia)x 75mm(L), 5mm(Dia) x 85mm(L), 6mm (Dia)x 93mm(L), 7mm(Dia) x 100mm(L), 8mm (Dia)x 110mm(L), 10mm(Dia) x 120mm(L), Three-Pointed design can quickly and accurately drill a smooth hole. Five-edged chamfer design will fast discharge chips from the hole on both sides automatically.
?Important Note?Use low speed when drilling (usually keep in 2000R/min - 3000R/min). too fast speed will off center, break the bit or jammed