The AP142022MM adapter makes your 1/4"- 20 compatible tripod or monopod Dual-T-Tab compatible. Use with Dual-T compatible holders, such as Arkon's TAB001 Slim-Grip Universal Tablet Holder, SM040-2 Mega Grip Universal Phone Holder, or SM060-2 Slim-Grip Ultra Universal Phone and Midsize Tablet Holder (not included). This adapter fits all tripods, monopods, and other devices with a 1/4"- 20 mounting bolt. Use AP142022MM with Arkon Models SP-SB-2T-22 22mm to Dual-T-Tab Adapter and Model SP-SB-RING-22 to create a secure Dual-T compatible connection for phone and tablet holders (Holders, devices, and adapters sold separately).