Compact, lightweight clamp-on rail allows light, laser, or iron sights to be mounted at a 45 degree offset to keep main sights or optics clear. Accepts MIL-STD 1913 Picatinny or Weaver style mounts and is available in 1-slot and 3-slot models. Machined aluminum clamping jaw provides superior holding strength with minimal wight increase. Mfg: Yankee Hill Machine Co., Inc. Aircraft grade aluminum, matte black, Mil-Spec, hard coat anodized. 3-Slot: 1-3/8" (3.5cm) long, 1 3/8" wide, 7/8" high. 1.2 oz. 1-Slot: A 3/4" (1.9cm) long. 1-3/8" wide, 7/8" (2.2cm) high. 0.7 oz. (34 g) wt.