The clamping bores of the T-angle connector clamps GN 191 are mechanically machined and designed for construction tubings GN 990 or DIN 2391, DIN 2395 and DIN 2462 respectively.
The standard clamping screws are socket cap screws DIN 912. They can be replaced by adjustable clamping levers GN 911 (article code see table of dimensions).