Milwaukee Shockwave Impact Duty attraction nut drivers are for uttermost durability and up to 10X life. Made from proprietary steel and heat aerated to activity hardness, the Shockwave Impact Duty attraction nut drivers a omnipotent magnet allowing for a guaranteed grip and bulldog bit engagement. The bits color coded rings for fast and elementary size identification and a chamferred edge to allow for fastening in close-fitting spaces. Broadly targeting conductor users, the Shockwave Impact Duty adjuvant line is not lonesome for heavy duty impact applications, but delivers a brimful system solution for all the user 's drilling and fastening needs. No. 49 66 4502 : 1 4 '' x 1 7 8 '' No. 49 66 4522 : 3 pack, 1 4 '' x 1 7 8 '' No. 49 66 4503 : 5 16 '' x 1 7 8 '' No. 49 66 4523 : 3 pack, 5 16 '' x 1 7 8 '' No. 49 66 4505 : 3 8 '' x 1 7 8 '' No. 49 66 4525 : 3 pack, 3 8 '' x 1 7 8 '' No. 49 66 4506 : 7 16 '' x 1 7 8 '' No. 49 66 4526 : 3 pack, 7 16 '' x 1 7 8 '' No 49 66 4532 : 1 4 '' x 2 9 16 '' No. 49 66 4533 : 5 16 '' x 2 9 16 '' 49 66 4535 : 3 8 '' x 2 9 16 '' No. 49 66 4536 : 7 16 '' x 2 9 16 '' .