Jefe Hex 13-Piece Hole Saw Set, Bi-Metal Hole Saw Kit, M42, And Plastic. ?Great Hole Cutting? M42 Premium high speed steel with 8% cobalt GT 4/6 variable tooth configuration to provide clean and fast cutting in various materials. 1-7/8"(48mm) cutting depth. Strong impact wear resistance. Multiple sizes can be cut with this set. ?Features?Wide slot design on side walls increases visibility while cutting, and also helps chip evacuation. Turtle back tooth configuration design offers heavy duty cutting. Fleam ground for faster cutting and longer life. Two pilot drills are made of premium high speed steel for precise positioning and rapid drilling for longer service life. ?Quality?3/16"(5mm) thickness heavy duty backing plate eliminates need for drive plate. M42 Cobalt bi-metal construction provides 30% faster cutting than conventional saws. 0.05" kerf design prolongs battery life when used on cordless tools. ?Wide Application? JEFE HEX hole saw set is great for tasks of cutting multiple hole sizes from small to large in desk surfaces, door locks, furniture, LED lights and pipes installation, and is ideal for thin metal, softwood, plywood, plastic plate, plaster and PVC board cutting. Working materials include metal, aluminium, brass, cast iron, plastic and wood. ?Package? 13-piece hole saw kit includes 9pcs saw blades including 3/4" (19mm), 7/8" (22mm), 1-1/8" (29mm), 1-3/8" (35mm), 1-1/2" (38mm), 1-3/4" (44mm), 2" (51mm), 2-1/4" (57mm),2-1/2" (64mm), 1 piece small mandrel, 1 piece large mandrel with adapter and 1 piece pilot drill bit.