Pro series 2 Flow bench valve opening Starter kit includes, heavy duty design with black anodized finish fully adjustable. Works with V8, V6 and 4 cylinder heads, canted and straight valve applications. Will work on 4 valve heads with adapter Part No. DEL-VOF2VA2 sold separately. Mounting blocks bolt to valve cover rails bolted to a 21″ long tee bar. Teclock dial indicator reads .001″ increments up to 1.000″ lift. Accessories included are center bolt style valve cover adapter brackets for General motors V8 vortec and LS1 cylinder heads w/hardware. Flow testing springs a (8) piece set. Dial indicator extension point a (6) piece set for more adjustability. Please e-mail us if you have any questions.