Description: 1.Dual metal hole with M42 hss steel material, the edge of the blade is not easy to fall off. 2.Meterial: M42 hss steel, strong and durable. 3.Widely used in Stainless steel plate, metal plate, thick steel plate,plate hole, home wood, galvanized pipe, fire pipe, plastic, gypsum board and other opening operation. 4.Size:16mm, 18mm, 20mm, 22mm, 25mm, 30mm, 32mm, 35mm, 38mm. 5.Applicable to the pistol drill, bench drill, vertical drilling machine etc. Package Included: 9PCS M42 Drilling Hole Saw Note: 1,Due to different producing batches, product details might be a little different. 2,The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 3, Please allow 1-3CM differs due to manual measurement