Woodhaven 8660 for SOSS 100 Hinge 8660 is for a SOSS 100 hinge - 3/8" wide x 1" long shallow mortise. Requires a 3/8" solid carbide upcut spiral bit (15406 or equivalent, sold separately) and a 5/8" Bushing & Locknut (5030 or equivalent, sold separately) to cut the mortises. Hinge setback is built-in according to the manufacturers specs. Jig clamps to the work (no nail holes) and, using your plunge router, both the long/shallow and short/deep mortises are cut without moving the jig or part. Has two retractable stops for the short/deep mortise. Requires a 5/8" OD bushing (our PN 5030K) and a 3/8" spiral upcut bit (our PN 15406), both sold separately. If using your own bushing, make sure the nose isnt over 3/8" long. Lifetime guarantee against defects in material or workmanship. Made in the USA!