This hole punch is perfect for thick-walled clay. The cutting tubes are sharpened polished brass covered with a rubber cap.
BEAMNOVA Knockout Punch Set 15 Ton 1/2 to 4 inch Hydraulic Metal Hole
140 Stud Punch - 7/8 Hole - Current Tools
Round Hole Punch Machine (dia 5mm) - Tool Parts - AliExpress
Bell Type 7-Piece Arch Punch Set – GROZ USA
1.25mm Metal Hole Punch Pliers With Guage Guard, Beadsmith Metal Hole Punch Pliers 1.25mm, Cuts Sheets Upto 22 Gauge Extra Long Jaw 7/8
Medium Duty 1/8 Single Hole Punch
Punch & Die Sets for Ironworkers, Edwards - Edwards Ironworkers
5/16 Hole Punch
Vintage Leather Hole Punch FOR SALE! - PicClick UK
The 7/8-Inch Knockout Punch easily punches holes for 1/2-Inch EMT conduit. The optimized design reduces wrench effort. Slugs are split inside for easy removal. Cuts aluminum, fiberglass and plastic as well.
Klein Tools 53819 0.875 Knockout Punch, 1/2 Conduit