Specialty Archery Peep Housing Black 1/4 in. BLK. 5 gr. Threaded to accept all 1/8" apertures verifiers and clarifiers. 37 degree peep should be used in bows under 40" axle to axle. Package Contents: Specialty Archery Peep Housing Ultra lightweight peep sight weighs only 7.5 gr. Threaded to accept all 1/4 and 1/8 apertures verifiers and clarifiers (must use reducer with 1/8). 37 degree peep should be used in bows under 40 axle to axle.