A na-akpọkwa ngere mgbochi mgbochi ịrị elu 358 (3 ″ × 0.5 ″ gu 8 guage) makwaara dị ka "ntupu ụlọ mkpọrọ" ma ọ bụ ngere mgbochi, bụ ogwe mgbatị pụrụ iche, anyị nwere ike ịme n'obodo anyị, mmepụta a na-enye ihe kacha mma. uru maka ịrụ ọrụ, ịdịte aka na ọdịdị, “358 ″ sitere na nha ya 3 ″ x 0.5 ″ x 8 nlele nke ya na ihe ruru. 76.2mm x 12.7mm x 4mm na mita.