Special chamfer steel counter designed sleeves or counter pilot hole bores. Adjustable depth meter sleeve with wrench.Woodworking drilling and chamfering removable parts. Seven pieces includes bits for pilot drilling holes for screw sizes 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 10mm. Drill length can be adjusted for various length screws simply by loosening and tightening the screw. Chamfer is 5 flutes, In the process of using, can discharge wood faster, smooth drilled disposable sink hole, perfect screw cap embedded in the workpiece surface. Feature: Single edge flute 90 degree chamfer Enlarge or countersunk holes, deburr edges; 15 degree chamfer Use on steel, aluminum and other metals, plastic or wood Great drill accessory for any job shop backed by the manufacturer's lifetime warranty Heat treated and tempered high carbon steel with Titanium Nitrate coating for superior cutting power Specification: Black chamfer drill body material: Steel Material: HSS 4241 Wood and steel drill bit 45 Chamfering drill Size: 3mm (Dia) x 60mm (L) 4mm (Dia) x 75mm (L) 5mm (Dia) x 85mm (L) 6mm (Dia) x 92mm (L) 7mm (Dia) x 100mm (L) 8mm (Dia) x 110mm (L) 10mm (Dia) x 120mm (L) Warning: Please be careful to avoid hurting your hands when removing this product. For your safety and the life of the bit: the hardness of the wood is less than 25 When using the smaller bits, be sure to control your efforts. If you receive the product with a problem, please contact us. Content: 7 x Wood cutter 7 x 5 Flute Chamfering 1 x Small Hex Wrench