Irwin Industrial Tools 3057002DS Magnetic Drive Guide Set with Tic Tac Container, 21-Piece Industrial-grade impact driver set is tested to meet the demands of professionals Each insert bit is made of alloy tool steel for durability 1/4" hex shank size 1" insert bits: #2 Phillips (10), #2 square (5) and 8-10 slotted (5) Screwdriver bit set also includes a 4-11/16" magnetic drive guide Industrial grade sets tested to meet the demands of professionals