set2: 4 x flash shoe mount + 1 x Roll Bar Mount for camera can be mounted on rails such as Bicycle stand, Bumpers, ski / surfboard racks as long as the diameter is within 3.5cm-6.35cm ( 1.4inch to 2.5inch ). Suitable For: HD Hero, HD Hero2, HD Hero3 3+. Compatibility: For HD Hero, for HD Hero2,for HD Hero3 3+ Easily attach dslr accessories to camera hot shoe mount or cold shoe mount. Flash hot shoe mount with 1/4inch-20 tripod screw adapter. To mount your microphone, LED light, monitor to DSLR, camcorder or digital camera, or adapt anything else that has a 1/4-20 receptacle. Easy to use. This universal adapter is with two thumb wheels and a 1/4inch screw nut. Fits on the hot shoe of most cameras. camera rig for all photographers. Material: PC + Stainless Steel/Aluminum Alloy Color: Black package Contents: 4 x flash shoe mount 1 x Roll Bar Mount Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.