1、High-strength nylon and aluminum alloy ensure long-lasting durability. 2、Swivel ball ensures a smooth full range of motion. 3、Perfectly work with your action camera on the kayak. 4、Easy to install and quick release, stainless steel bolts are included. 5、Camera base bracket is an excellent accessory for canoes, inflatable boat, small boats and yachts. Material: Nylon + Aluminum alloy Model: GP25 / GP40 (optional) GP25: Total Length: 50cm / 19.7in Tube Length: 25cm / 9.8in Tube Diameter: 2.2cm / 0.9in Base Diameter: 6.5cm / 2.6in Weight: Approx. 510g / 1.1lb GP40: Total Length: 65cm / 25.6in Tube Length: 40cm / 15.7in Tube Diameter: 2.2cm / 0.9in Base Diameter: 6.5cm / 2.6in Weight: Approx. 550g / 1.2lb Square Installation Seat: Size: 10*10cm/ 3.9*3.9in Weight: 133g/ 4.7oz 1 * Mount Stand 1 * Square Installation Seat 2 * Screw