Maƙallan hawa masu nauyi don naɗaɗɗen kofofin kasuwanci
Don zama 3/16 ″ (4.76mm x 4.76mm) kusurwoyin karfe mai kauri da kauri mai kauri 1/4″ (6.35mm) takalmin gyaran kafa na karfe mai kauri wanda aka weka a cikin sigar triangular don tallafawa ƙarshen taron ganga.