Spider Camera Holster Plate With Pin for Spider Pro Holster Description. The Plate With Pin from Spider Camera Holster is part of their Single & Dual Holster Systems. The Pin attaches to the Plate & the Plate attaches to the cameras tripod socket. Once assembled the entire rig slides & locks into the Holster. A two-position locking system secures your camera. When placed in the lower position the camera remains firmly in place in the holster. When placed in the upper position you can withdraw the camera.