Colour Name:7 Pcs Product Specification 7Pcs Countersink Drill Bit(3-10mm),High-Speed Steel Drill Adjustable Carpentry Reamer Drill Bit Set with One Hex Key Suitable for Wood DIY Drilling Holes     Material: high speed steel Handle: Round Handle Use:Wood Drilling Application:use on Polyurethane(pu), Rubber, Plastic and Acrylic, perfect for HARDWOOD or SOFTWOOD， large chip flute and five-edge chamfering machine, the operation of faster discharge of sawdust, you will get a nice smooth surface on any type of hard, soft wood or aluminum. Dimension: Drill Diameter x Overall Length 3mm(1/8") x 60mm(2.36") 4mm (5/32'')x 75mm(2.95") 5mm(3/16") x 85mm(3.34") 6mm (1/4")x 93mm(3.66") 7mm(9/32") x 100mm(4.05") 8mm (5/16")x 110mm(4.33") 10mm(25/64") x 120mm(4.72") Packing Includes: 7x Countersink Drill Bit 1 x L-wrench Warm tips : ①The best use of this product is to use a bench drill, because the hand electric drill is not fixed in the operation process, the drill bit (especially the 3mm and 4mm) is prone to bend and break!!! ②Try to keep the drill vertical while drilling, so as not to be uneven  is prone to bend and break
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