Drop Forged Beam Clamp - Swivel Features :- Nut Size - 1/2" BSW Thread x 21mm AF Available Flange Nut sizes - 22 / 23mm AF Tee Bolt - 1/2" BSW Thread, Available in Mild Steel or Boron Steel Hex Bolt - 5/8" x 76mm (Mild Steel) Head 21mm AF For 48.3 OD Tube size Finish - Zinc Plated Std. Packing - 20 Pcs/Bag, 800