Magnetic Base Dial Indicator Holder with Fine Adjustment 135 lbs Holding Power Magnetic Base With Fine Adjustment For Dial Indicator Fixed arm height:7";Fixed arm diameter:0.464";Extension arm length:6";Extension arm diameter:0.385" Magnetic Base dimension: 2-1/2'' L x 2''W;Holds 3/8" stem and lug back Holding Power: 135lbs;;Shipping Weight: 3 LBS Quantity: 1