For use with Black & Decker BDEDMT and BDCDMT112 * Tool-free blade change for Fast & Easy change of blades * Variable Speed allows for precision performance that's right for each job * RPM (12v Max = 0-6800, 20v Max = 0-9000 and AC 4A = 0-7300) The Black & Decker BDCMTJS Matrix Jig Saw Attachment has a compact design that maximizes user control for access in tight spaces. Its variable speed allows for precision performance that's right for each job. The BDCMTJS accepts both U and T shank blades. This jig saw attachment can be used with any tool in the Black & Decker Matrix line including the BDEDMT and BDCDMT112.