Locking black or silver seatpost collar with M6-0.8 X 30mm Pin-in-Hex Socket Head Cap Bolts and M5 L-Key. You can determine the size you need by measuring the outside diameter of your bikes seat tube (not the seat post). This clamp will slide over your seat tube, so sizes of 28.6mm or 31.8mm must correspond to your seat tube diameter. Key Features: Size: 28.6mm, 31.8mm Height: 16mm Material: Aluminum Alloy Finish: Silver or Black Quantity: 1 Seatpost Clamp, 1 M6 x 22mm security bolt, 1 M5 Key, and 1 non-security bolt
