Dotco Sander Belt Attachments are for use with Dotco belt sanders. Known for it’s durability, dependability, and versatility, The Dotco Sander Belt Attachments comes in 300 series collet with -36 termination or a 1/4”-28 internal thread with a -32 termination that is for sanding belts sizes 1/4”x12”(6.4x305mm) to 1”x24”(25x610mm) and sanding areas 1/4”x4”(6.4x102mm) to 1”x10”(25x254mm).