Technical Specifications Set Contains Mag Base With Microfine Adjustment Screw, 3-9/16 Extension Arm, Dovetail Mounting Kit Contains: Mag Base With Microfine Adjustment Screw, 3-9/16 Extension Arm, Dovetail Mounting - Xtra Mag Magnetic Base 52-585-105

Technical Specifications Set Contains Mag Base With Microfine Adjustment Screw, 3-9/16 Extension Arm, Dovetail Mounting Type Xtra Mag Magnetic Base Brand Name Fowler �¡2 universal ball sockets �¡Microfine adjustment screw �¡3" extension arm �¡Dovetail mounting �¡Range: .030" �¡Reading: 0-15-0 �¡Jewelled movement �¡Graduation: .0005" �¡Auto-reversing �¡.080" diameter point.