The double-ended bit assortment includes Square 0-0, 1-1, 2-2, 3-3; Philips 0-3, 1-2; Flat 4-6. Shaft serves as a 1/4" Hex driver. Features 4 special double-ended bits created by PL Robertson to be compatible with Megapro screwdrivers. All authentic Robertson tips are manufactured from a specially modified tool steel and carefully heat treated to provide maximum wear and torque. Retractable cartridge and Palm-Saver Technology.The EZ Guide collar helps maintain full contact between the bit and the screw for easier screw driving. The Shaft is made of alloy steel while the handle is made from engineered Triax 1120 resin, an ABS-Nylon alloy. This professional grade driver is made in the USA and has a Lifetime Limited Warranty.