Rail Features:- Serrated rail sides interface with our proprietary clamp design to mechanically lock it in place so no movement is possible. Serrations are not sharp, will not damage bags or your hands.- Rail is backwards compatible with standard Arca accessories, but will not be locking without our clamp- Rail is 6a ^2 long and weighs in at a paltry 2.2oz- Made to the RRS 1.5a ^2 Dovetail Standard, so you can be sure lever clamps will work- No sharp edges. Every corner is radiused, and every edge is chamfered on the machine. This takes longer to make, but it is the only right way.- Type 3 Hard Coat anodized for additional durability.- Made from 6061-T6 Aluminum- Made in-house here in the USA from USA sourced Aluminum on USA made CNCs- Rail comes with all M-LOK mounting hardware