Black Gold - Rush 3 Pin (Black) Specifications Housing side (inside diameter): 1-3/4" Weight (oz): 5.6 Mounted length: 3-7/16" x 3-7/8" x 4-5/16" Adjustment: Vertical and horizontal calibrated gang - Machined aluminum guard for maximum durability and pin protection - Fluorescent interchangeable guard rings for quick and sure peep alignment even in low light! Nitrous Green standard - Large adjustable level lets you easily set your 2nd axis - Sculpted base with oversized clamping dovetail - Calibrated horizontal and vertical gang adjustment - The revolutionary SkyCoil gathers light from above for unmatched pin brightness when you need it! - Automatically darkens in bright light to dull pins, prevent pin halo. Patent #7290345