Seven solid steel gun makers tools with knurled "handles" stamped "BOSS" including 10, 12, 14, 16, 20, 28, and 32 ga. The 12 bore gauge was often removed from box and has two incised lines corresponding to 2-1/2" and 2-3/4" chambers. Others have scratched in lines corresponding to various chamber measurements. All are in black painted wooden box with dual hook closure, lined in green cloth. A unique and useful bit of gun making history. SIZE: CONDITION: Excellent. 53177-14 mgm187 (2,000-4,000)