2Tone IA Peep Set Dual anodized color allows for easy sight recognition for all shooters and skill levels. All pieces are precision CNC-machined aluminum construction 38 degree angled design for shorter axle-to-axle to bows No special tools needed just 7/32 Allenfound in most standard kits. 2Tone IA provides improved sight in low light situations and eases changing the aperture and funneling of light to the shooter Peep is 5/16 without insert installed. Insert sizes includes 7/32 , 3/16, and 1/8