L.S. Starrett No. 657A Magnetic Base Indicator Holder

• Provides universal adjustment in both horizontal and vertical planes
• For use with all Starrett Test, Back-Plunger, AGD, Dial and Miniature-Dial Indicators
• Accommodates similar indicators of other manufacturers
• Powerful, permanent magnetic base holds firmly to steel or iron surfaces - horizontally, vertically, upside-down
• Push-button turns magnetic force on or off for quick, one-hand set-up and take-down
• V-step adapts base to horizontal or vertical arbors and chucks
• Black wrinkle finish on non-working surfaces