Building-Plans › CNC Workholding - T-track and Inserts Image 1 of 1 CNC Workholding - T-track and Inserts $5.00 Included are the vetric, pdf, and svg files for the workholding designs, as well as the t-track and insert patterns. Add To Cart Added! Included are the vetric, pdf, and svg files for the workholding designs, as well as the t-track and insert patterns. You Might Also Like LED Desk Light - Japanese Style $5.00 Outdoor Sofa Building Plan $15.00 Power Tool Wall $5.00 Sewing Frame Building Plan (Bookbinding) $20.00 Compressor Shop Cart Plans $5.00