The Apollo PEX 1/2 in and 3/4 in. 2-in-1 PEX Pipe J-Hook Pipe Support (10-Pack) is innovative and simple to install. It features a unique collar design for the securing of either 1/2 in. or 3/4 in. PEX pipe to joists or studs. The Apollo PEX system is a comprehensive piping system comprised of brass fittings, poly alloy fittings, manifolds, valves, fasteners, tools and tubing designed for implementation in water delivery systems, simple or complex.Constructed of durable plastic for superior reliability and strength,Collar design holds PEX tubing in place,Use with PEX tubing (not included),For use with 1/2 in. or 3/4 in. PEX tubing,On j-hook for two sizes,Extended length fastener for additional stability and security