4mm Solid Steel Hole Punch works on leather, rubber and thin foil.
Tandy Leather Craftool Round End Punch 3/4 3171-03
4mm Silent Revolving Heavy Duty Leather Hole Punch Stitching Hand Pliers 4 mm Pitch 2/4 Teeth Leather Craft Tool for Belts Purses Watch Bands
Hirsch Strap Oval Hole Punch Found
Watch Tools - Strapcode
Round Hole Punch, Hollow Cutter High Carbon Steel Leather Punch Tools for Paper Plastics Canvas Belt Bags DIY Making
4 mm Round Hole Punch, Hollow Cutter High Carbon Steel Leather Punch Tools for Paper Plastics Canvas Belt Bags DIY Making
Leather Watch Strap Notch Cutter Belt Round Square Hole Puncher Pin Buckle Hole Clipper Opener Leather Craft Tool
4mm Silent Revolving Heavy Duty Leather Hole Punch Stitching Hand Pliers 4 mm Pitch 2/4 Teeth Leather Craft Tool for Belts Purses Watch Bands
Watch Tools - Strapcode
Leather Hole Punch Tool Oblong Punch Professional Grade 5mm or 3/16 Inch for Leather Belt/watch Strap/collar/handbag/purse Oval Punch AD - Israel
Watch Tools - Strapcode
Heavy Duty Belt Leather Round Hole Puncher Punch Tool Plies
Watch Strap Punch: Round – Leatherwork School Shop
Watch Tools - Strapcode