Windage-adjustable, tunnel front sight comes with 12 interchangeable inserts so you can choose the sight picture that's best for the distance and range of your target. The spirit level helps you hold the rifle completely upright to eliminate inaccuracies caused by tilting to the left or right. Perfect companion for the Creedmoor Rear Sights. Inserts available separately. Level Bubbles - Replacement bubbles in sets of 6, with two each of red, blue, and yellow-green. Mfg: Davide Pedersoli S.R.L SPECS: Steel, blued. Sight - 1 " (2.8cm) OAL, 1-13/32" (3.6cm) maximum width at adjustment knobs. Fits 3/8" (9.5mm), 60Adeg dovetail. Instructions included.