Review on 🔌 Morris 22396 Plastic Knockout 10 Pack: Reliable and Durable Electrical Conduit Punch-outs by Christopher Smith

later The nominal 1-1/4" size fits fairly loosely in the actual measured 1-1/4" hole. It will not "click" or stay in a hole in a .030" sheet metal. Very disappointing. Careful measurement of this fork: Head: 1-3/8" (35mm). Shaft: Just over 1-1/8" (B > 29mm).