150pc Carbon Steel Hex Head Key Screw Assortment Set in 12 Sizes
Hex key heads are interchangeable with Allen. Heat-treated carbon steel with black oxide finish for hardness, durability, and resistance. 20 Pc – 5/16″ x 3/8″ 18 Thread. 10 Pc – 3/8″ x 3/8″ 24 Thread.