Erick Magna Holder Model 350A Base  3-1/2" x 1-1/8" x 1-1/2" precision lateral adjustment with 1/2" travel attachments to accommodate practically every type test and dial indicator. small test Indicators mount the 6 inch long, 1/4" diameter stainless steel attachment in a 360 Base has powerful magnetic pull in excess of 90 lbs. with magnetic release