Knurling no. 1 Adjustable Spring loaded clamp type knurling tool. Maximum Capacity- 2" ( 50 mm) Shank size 3/8" Knurl Dimensions- 3/4" x 3/8" x 1/4" 2 Spare knurls Knurling no. 2 Sturdy V clamp type knurling tool Can be clamped in Standard Holder of the Quick change tool post on the lathe. Also Compatible with Myford, Boxford, ML7 Series, CNC & Other similar size lathes Tool Capacity ranges 5 -20mm Holder size : 3/8" x 3/8" x 2 -1/4" Paired with diamond kurls - left hand and right hand. Knurl size - 3/4" x 3/8" x 1/4" bore.