These clamps apply a finely dosable pressure on the nipples with 4 screws. The screws are 4mm wide and have a rounded tip. This clamp can be screwed together to a safety diameter of about 3mm. Comes in a set with 2 clamps.

Outer Diameter: approx. 26 mm
Inner Diameter: approx. 20 mm
Height: approx. 10 mm
Material: Stainless Steel