Doc Johnson Vac-U-Lock Knuckle Up
The Doc Johnson Vac-U-Lock Knuckle Up is a strap on dildo with a difference. Compatible with a Doc Johnson Vac-U-lock system harnesses for strap-on play, or slip your fingers into the rings and then slide the 4 inch phallus into yours, or your lover's, vagina or anus.
The Knuckle up is made from firm plastic and is the ideal strap on sex toy for control or power play thanks to it's harder feel and more menacing appearance. Use with a water-based sensation lubricant for an even more intense experience.