Build Pro makes a few different tables. Here's the one that I have...that has the 16mm holes(from website).

StrongHand Tools® FixturePoint Convertible Welding Table

Tabletop Size: 36" (900mm) x 24" (600mm)
Table Height With Leg Frame: 34" (860mm)
Table Height Without Leg Frame: 6-1/4" (158mm)
Diameter of Table Holes: 0.63" (16mm)
Grid Pattern: 2" (50mm) x 2" (50mm)
Tabletop Material Thickness: 0.16" (4mm)
Weight: 67 lbs (30kg)QUOTE=Rambozo;58253]The BuildPro is 5/8" on 2" centers, while the Siegmund are either 16mm on 50mm centers or 28mm on 100mm centers.[/QUOTE]