HD-Schelle 51-55mm Bolzen Ladeluftsystem Schlauchschellen Schellen mit Bolzen HD-clamp bolt 51-55mm Hose clamps with M8 bolts The strongest clamps for charge air systems These clamps can be tightened extremely tightly using the M8 bolts. The clamps can easily be used for exhaust systems- For boost lines, it is the strongest there is. Material : galvanized steel Size : 51mm to 55mm Bandwidth: 20 mm Be careful that silicone tubing is always measured inside. To the specification of the silicone hose you must add 8-10mm to get the outer diameter.