1、The premium gear design makes the hole more accurate and symmetrical, and carbon steel teeth provides rapid and clean cutting. 2、This hole saw kit is made from carbon steel material, and surface is treated with black oxidation which provides mild corrosion protection to the treated parts. 3、Accuracy fully ground manufacture which ensures smoother chip remove. With high accuracy, smooth cutting edges, especially impact resistance, and wear resistance. 4、The set includes popular hole saw sizes to meet your different demands. The deepest cutting depth is 25 mm. The set also covers a hex key and 2 center drill. 5、Equipped with the hole saw kit holder with size index for easy storage and organizing. Designed to keep all components organized and convenient to carry. Item Type: Hole Saw Kit Material: Carbon Steel Purpose: Carbon Steel Hole Saw Colour: Black System: Metric Cooling Type: External Cooling Cutting Diameter: Approx. 19mm / 0.74in, 22mm / 0.86in, 29mm / 1.14in, 32mm / 1.25in,38mm / 1.49in, 44mm / 1.73in, 51mm / 2in, 64mm / 2.51in, 76mm / 2.99in, 89mm / 3.5in, 102mm / 4.01in, 127mm / 5in Diameter of Handle: Approx. 9.5mm / 0.37in Outer Blade Tip Angle: 45° 12 x Hole Saw 2 x Mandrel 1 x L Shape Wrench 1 x Installation Board 1 x Grey Storage Box