1. With a flexible hose, you can work in tight spaces. Thick pipes and extended mounting rings enhance the sturdiness and durability of the flexible shafts. 2. No specific interface requirement for the electric grinder; compatible with any electric grinder or drill that allows attachment. Features a 6.5mm size for easy installation—simply attach the power connector handle to the grinder. 3. Installation is convenient and straightforward. Attach the connector handle to the electric grinder. The shaft connector must be used with an electric grinder. 4. Extends power tools for grinding small workpieces in confined areas. Specification: Material: Metal. Shaft Installation Instructions: 1) Remove the rotary nut from the collet and the top cap from the rotary tool. 2) Slide the collet nut onto the shaft core. 3) Insert the shaft core into the neck. 4) Tighten the collet nut securely to hold the shaft core in place. 5) Screw the shaft connector onto the rotary tool to ensure the shaft core is fully engaged. Drill Bit Installation Instructions: 1) Insert the included L-bar into the hole on the side of the arbor clamp. 2) Unscrew the clamping nut from the shaft. 3) Insert a drill bit (not included) into the clamping rod. 4) Tighten the clamping rod nut. 5) Remove the L-bar. Package Contents: 1 flexible shaft, 1 handle, 1 key.