3pcs HSS Steel Step Cone Drill Titanium Bit Set Hole Cutter 4-12/20/32mm    Features: - Set of 3 for jobs of all sizes. - 2 fluted edges for faster, smoother cutting. - Hex shank prevent slippage when in chuck. - Surface treatment: Titanium plating. - Ideal for using to cut holes in a variety of materials including steel, brass, wood, plastic, etc. - Material: HSS steel. - The lengths are separeately 104.5mm ( 15 step ), 74mm ( 9 step ), 67mm ( 5 step ). - Rotational speed: 600rpm - The 3 cutters come in the following sizes: 4 - 32mm ( 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm, 30mm, 32mm ). 4 - 20mm ( 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm ). 4 - 12mm ( 4mm, 6mm, 8mm, 10mm, 12mm ).   Package weight: 0.255 kg Package Size(L x W x H): 14.60 x 8.50 x 3.00 cm / 5.75 x 3.35 x 1.18 inches Package Contents: 3 x HSS 4241 Hex Shank Step Cone Drill Bit Set Hole Cutter