Vac-U-Lock Code Black 8 Inches Raging Hard-Ons Dong Attachment. Plush to the touch, this solid black Vac-U-Lock attachment features a unique spiral design for incredible satisfaction! Use with any Vac-U-Lock set or accessory. O-ring compatible. material. Specifications: total length 8 inches, insertable/usable length 8 inches, width/diameter 1.5 inches. Material PVC. Proudly, made in America.