The invention discloses a kind of top hammer linearity and roundness measurement instrument, top hammer includes work head and connection cylinder, the connection cylinder is truncated cone-shaped, survey tool includes base and the support frame being arranged. The invention discloses a kind of top hammer linearity and roundness measurement instrument, top hammer includes work head and connection cylinder, the connection cylinder is truncated cone-shaped, survey tool includes base and the support frame being arranged. ll who use them. Our aim is not only to offer value with our tools, but to think together with our customers, share inspiration with them, and continue to take o r all companies. instrument stands are fabricated from 2" Schedule 40 Pipe and utilize a flat cap design along with 8" X 8" X 3/8" base. We offer the complete solution including shank adapters, drill rods, drill bits, accessories and added value services. We offer you tophammer equipment for every application, such as underground. PTFE, 25% glass filled slide plates are primarily used in low heat and high velocity conditions; however, this material can be used in high heat applications in conjunction with other materials. We offer a complete line of adjustable instrument support components which, when combined, will create various configurations to your.