Q550ALR - 18GA CLEATER PRIMPACT ADJUSTABLE BASE / WHEELS 550-143The 550ALR version features a fully adjustable baseplate providing 3 distinctive advantages: 1. Assembled with A866 PrimeSurfer roller base2. Short nose and compact valve design provide an all around striking surface, enabling the nailing of more boards closer to the end walls. 3. No shims required. The built in adjuster eliminates the use of shims to match the board thickness. Installs 3 8" to 3 4" (10 to 19mm) flooring Fastener Type: 18ga 1 1 4" 1 3