The 360 Flexible Adhesive Base can be mounted to both flat and curved surfaces. Tech Specs: Four tabs with super secure 3MT adhesive for curved surface mounting. Compatible with any Quad Lock 360 Arm or Head. Tough, nylon construction. Base: 60 mm x 60 mm with a height of 18.3 mm. Tabs: 28 mm wide with two grooves. Note: NOT intended for severely curved surfaces (e.g. 180°). What's Included? 1x 10 mm spacer. 2x screws (1x M5x30 and 1x M5x45) are supplied for connecting spacer to a Quad Lock 360 Head or Arm.