Cross hairs are beryllium wire measuring .010 inches thickness KNS Precision "cross hair" type front sights offer the shooter a front sight that covers less of the target at longer ranges. The 0.240" diameter CNC machined blackened brass housing offers a large, bright field of view. Hooded sights have 0.250" housing for greater protection of the cross hair under demanding conditions and better shielding from stray light. FeaturesScrews in to front sight base of AR-15 riflesHooded for additional light consistencyPrecision machined with fine wire cross hairsAperture measures .240 inches diameter