Mitutoyo 7010S, Magnetic Base, For 3/8" and 6mm/8mm Stems, On/Off Switch, 132 Lbf Magnetic Pull Compatible with Mitutoyo dial and dial test indicators, as well as similar indicators from other manufacturers Push-button on/off switch for one-handed operation Grips horizontally, vertically, and upside down for versatility 132 lbs-force of magnetic pull for security Holds 6 mm, 8 mm, and 3/8" diameter rods