KD Indexing Tie Rod Separator 21/32" Opening 3991 Recommended use of only 0, 20, -20 Degrees positions when in use for manual or pneumatic striking mode. Can also use in 90 degree position when striking the manual hammer surface. Indexing feature allows for access in tight areas. Manual hammer position keeps your hand safely out of the way when using tool, so you can swing harder without fear. To use, insert 21/32" opening between parts and strike with hammer. Seperator is forged to withstand hard useage. #10