1、ADJUSTABLE LIMIT: Limit countersink drill bit set, adjustable position, with reasonable structural design, which is convenient and practical. 2、ALLOY STEEL: The countersink bit is made of excellent alloy steel with fine machining, has good bending resistance and wear resistance. 3、FAST CHIP REMOVAL: The spiral slot with central drill bit will quickly discharge debris from the hole, preventing debris from being trapped and accumulated. 4、45 STEEL CHAMFER: The countersink bit chamfer is made of 45 steel, which has high hardness, impact resistance, and has a longer service life. 5、SPECIFICATIONS: Including 10pcs adjustable countersink bits with different specifications, equipped with wrenches and screws, has good practicality. Item Type: Countersink Bit Material: Alloy Steel Color: Silver Specification: 2.8 x 8mm, 2.8 x 10mm, 3.0 x 8mm, 3.0 x 10mm, 3.2 x 8mm, 3.2 x 10mm, 3.5 x 8mm, 3.5 x 10mm, 4.0 x 8mm, 4.0 x 10mm Use: For spot facing and drilling of wood, plastic, soft metal, fiberboard, aluminum alloy screws, etc. 10 x Countersink Bits 10 x Flat Wrenches 10 x Hex Wrenches 10 x Machine Screws 10 x Storage Boxes