Pinch clamps are designed to fit most popular polyethylene and polybutylene water service lines. They are perfect for sprinkler systems, irrigation systems, and most other low-pressure applications. They are marine grade clamps, all 300 stainless steel for excellent corrosion resistance, welded construction for superior strength, easy installation, permanent, tamper-proof 360 deg. seal. Compatible with most clinching tools. How to determine proper pinch/crimp clamp size: Measure actual outside diameter (O.D.) of the hose on the fitting. Select the nominal size clamp nearest to that size, but always larger than the O.D. of the hose on the fitting. Ideal crimp clamp tool sold sepatately, Model No. 61001-58 (SKU 452806). Clamps available in 2 sizes. 10-pack.