The Grace USA Gunsmith 24 Bit Magnetic Tip Screwdriver Set is made soecifically for the gunsmith trade. The high quality set includrs eleven Grave USA Parallel Hollow Ground slotted bits that are designed the way they should be. Each one is precisely made so the bit portion that fills the slot of each gun screw is parrallel the depth of the slot until the Hollow Ground takes effect giving the right radius for optimum strength. Each bit is made to the dimensions gunsmiths have found to be most useful which are .025 X 120, .025 X .200, .030 X .270, .031 X .150, .033 X .190, .038X .200, .041 X .270, .045 X .240, .050 X .310, .070 X .350, .070 X .420. The set also includes three Phillips bits #0, #1, #2 and eight Hex bits 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 3/16" and two Trox bits T-10 and T-15. All bits are made of S-2 Tool Steel and properly hardened for strength and durability. Each bit fits snugly in our spinner that is securely assembled to our classic Grace USA wood handle for positive grip. The set fits neatly in a hand bench block and entire kit is 100% made in the USA and backed by our Forever Guarantee.