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.