Use with milling machines, lathes, etc. Supplied with a fine adjustment clamp for indicators, electronic probes, etc. 85 lb. pull Base dimensions: 2" x 2-11/32" x 1-13/16" (50mm x 58.7mm x 46mm) Height: 9.5" Accepts all AGD dial indicators. V-base for placing on round surfaces. On/off lever releases magnet. No risk of marring polished surfaces. Mounts test indicators with 1/4" spigot. On/off switch conveniently located.