Connection clip: To fix a tarpaulin on the arches with an external diameter of 16 mm. of a greenhouse. Please check the diameter of the poles before purchasing. Sturdy material: These greenhouse clamps are made of strong, cold-resistant high quality ABS plastic with long service life. Greenhouse clamps: Convex surface design, won't slip off your fingers when squeezed, firm glossy surface, to fix the greenhouse tarps well and play an effective protection role. Fixing function: Allows quick and easy attachment of waterproof fabric, shade fabric or netting to any type of tubing. Wide Applications: These greenhouse clamps are used to secure tarpaulins, sun shades, greenhouse films or netting to tubes, and are also ideal for building greenhouses, ground guards, etc. Please note that due to manual measurements and display differences, there may be slight differences between individual products and photos.