The R.S. Bow-Vise securely holds your bow in an upright position allowing flexibility of tipping forward or side to side and locking at any angle. The R.S. Bow-Vise gives you hands free mounting of accessories and adjustments. The R.S. Bow-Vise features a micro adjust knob for alignment of nock and sight installation. Includes EZ-Nok and string Level. #8240 Same features as the #5820 but for parallel limbs.