Interlock hose clamp/ 2or 4 bolts hose clamp Material: Carbon steel Silver Zinc plated Size: 3/8:-4" Reg No.: CD, A4,B4, A9, BU 9, BU9S, A10, B10, BU14, B14,BU19,B9,BU24,B24,BU29,B29,BU49 Pressure: 8 bar Bolts Number: 3/8"-3/4" 2 bolts, 1"-4" four bolts Usage: For use with tank cleaning couplings, ground joint couplings, interlocking type inserts and universal couplings. Interlocking couplings should be used for a securely locking coupling to hose. Advantage: 1) Interlock clamps are used on any fitting with a collar to engage the forward gripping fingers of the interlocking clamp. 2) They are most commonly used on ground joint females and male collared nipples. 3) Smaller sizes provide a safe and economical securing method for universal hose ends. 4) The forward gripping fingers engage the collar preventing the shank or stem from pulling out. 5) Tightening the bolts secures the clamp around the O.D. of the hose.