/ Precision Measuring Tools / Precision Hand Tools / Precision Rules, Straight Edges & Parallels / Precision Rule Accessories / 298 * Not actual product image 51327 298 Key Seat Clamps (Pair) 51327 Other similar products Key Seat Clamps convert steel rules, combination square blades and straight edges into key seat rules for laying out keyways and scribing parallel lines on round work. Clamps are 1" long x 7/16" wide (25 x 11mm) and have a 7/64" (2.8mm) slot width. Features Parts Contact Starrett Features Case hardened steel To convert rule into Key Seat Rule Parts Member of Kit Item #DescriptionPart No.QtyInformation 1SCREW, .140-40 THUMB X .313 LONG01251-02 2BLOCKS, PAIR #29801250-02