Check the listing for details. Magnetic Base Mag Base for Dial Test Indicator Fine Adjustment on off Switch V G. Condition: New. Listed at 39.04 USD. Base weighs 3 pounds and has built-in super strong magnet with 176 pounds (80 Kg) of holding powerAccepts nearly all AGD dial and test indicator mountsMagnet has an On/Off switch which easily and quickly engages / releases magnetFine adjustment knob for precise positioningDoes not come with plastic case This is a magnetic base for use with dial and test indicators Features: 1) Base weighs 3 pounds and has a built-in super strong magnet with 176 pounds (80 Kg) of holding power 2) Magnet has an On/Off switch which easily and quickly engages / releases magnet 3) Base has V-groove on bottom for mounting on cylindrical surfaces 4) Fully adjustable chrome plated two-arm design 5) Fine adjustment knob for precise positioning 6) Accepts nearly all AGD dial and test indicator mounts 7) Overall height 9 inches 8) The vertical arm extends 7 inches from the base. The cross arm is 6 inches in length 9) Does not come with plastic case