The Current Tools 166SS Knockout Punch & Die Set is designed for punching 2-1/2" to 4" holes in stainless steel up to 10 gauge. It features a four-point punch design for easy slug removal and includes a 3/4" x 5-1/2" draw stud, a 3/4" x 1-1/8" x 5-3/4" draw stud, and a durable metal case for portability. This set is ideal for electrical contractors requiring precision and durability in stainless steel applications.