Features:- Set of 3 for jobs of all sizes - 2 fluted edges for faster, smoother cutting - 3 sided shanks 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 103mm, 74 5mm, 64mm - 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: 0 273 kg Package Size(L x W x H): 12 80 x 8 00 x 3 50 cm / 5 04 x 3 15 x 1 38 inchesPackage Contents: 3 x HSS 4241 Step Cone Drill Bit Set Titanium Coated Hole Cutter