Fabrication: CNC Laser, Waterjet, Plasma, Welding | Welding clamps that fit in hole in table - hole specs | Practical Machinist - Largest Manufacturing Technology Forum on the Web
Inserta Clamps [16 mm] – Workbench Pros
Welding Table Clamp Accessory, Variable Angle Device for 16 mm Matrix Tables | Bessey Tools
T-Post Clamps, Fit 5/8 Holes – Strong Hand Tools
Quick Clamp - 3/4" System
PIHER - TCP clamp for welding table | SET 16mm - Tendotools
Bessey TW16-20-10K - Table Clamp, tommy bar, std pad, 16 mm - Federated Tool Supply