Rock Exotica rockGrab RG2. Featuring a conventional cam attachment hole, the advanced version of the traditional rope grab — the ROCK EXOTICA ROCKGRAB RG2 — has been designed to be left on the rope. This rope adjuster works with 9 to 13 mm rope, performing efficiently and perfect for horizontal lines. The rockGrab body is one of the lightest grabs in the market, having been filed along its side to take out any expendable material. In conjunction with is, the rockGrab’s axle rests fully inside the body, allowing for a slim design, devoid of unnecessary external bolts or pins.