The PXL Hunter Peep Capture Aperture is an insert fitting into the PXL Hunter Peep in three sizes 1/4, 3/16, 5/32 to suit your lighting and shooting needs. Features include nonglare material, toolless installation/removal. Features. Dual string angles 37 and 45 degrees. Accepts PXL apertures and peep shade cap. Deep perimeter groove for added security. Center string alignment for perfect centering on string. Toolless aperture installation/removalSpecifications. Color Black