Oetiker 62319 Metal Stainless Steel Pex Clamp, 0.75" Size (Pack of 50) Installation tool for use with stepless ear clamps for PEX tubing and ASTM F1807 or F2159 insert fittings (not included) Safety feature releases ratchet when proper degree of clamp compression has been reached Ratcheting pincer operation for single-hand use Tool is lightweight for easy handling The ear clamp's special design eliminates steps and/or overlaps on the inner circumference of the clamp for a 360 degree leak-free seal