5pcs M5 50mm Stainless Steel Safely Spring Snap Quick Link Lock Ring Carabiner material:stainless steel durable and rust resistance dimension is approx 5.2 x 2.45cm/2.04 x 0.96""(L x W) you can use it for backpack,key ring, chains,ropes,hiking,fishing,indoor and outdoor equipment gear,DIY 5 PCS in one package