Specification BaseType : Pedestal Brand : SPI BulletPoint1 : Compatible with vertical indicator holder arms BulletPoint2 : Allows user to quickly and accurately set table BulletPoint3 : 12 inch overall length BulletPoint4 : Precision working surface measures 3-1/4 inch square. Parallel fine adjustment has 0.100 inch travel. 5-3/8 inch clearance between base and indicator holder. Overall base dimensions: 4 inches x 5-3/4 inches x 1-1/2 inches. BulletPoint5 : Furnished with 2 bushings for 3/8 inch and 8mm indicator stems Color : Black ItemName : SPI 20-837-1 Indicator Positioner & Holder Extension Arm: 12 inch Overall Length ItemShape : 12 inch ItemTypeKeyword : indicator-stands Manufacturer : MSC Industrial ModelName : 20-837-1 SPI ModelNumber : 20-837-1 SPI PartNumber : 3994779 ProductDescription : Meant for use with vertical indicator holder arms, this optional extension arm allows users to quickly and accurately set table. 12 inch overall length.