Comparison : Item # 15X2F, Industrial Interchange 1/4" Body Size (Type 15)
Item # 15X4F, Industrial Interchange 1/4" Body Size (Type 15)
Item # 15X6F, Industrial Interchange 1/4" Body Size (Type 15)
Item # 15X2M, Industrial Interchange 1/4" Body Size (Type 15)
Item # 15X4M, Industrial Interchange 1/4" Body Size (Type 15)