Altra Insert and Outsert .166 400 Spine Comes in 12 pk QTY;Available in four sizes - 250, 300, 350, & 400 spine;50gn Total Weight;Accepts micro FMS insert weightstable.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; } Item Category Code: 1100 Product Group Code: 1100A Product Sub Group 1: 1100A2 Inactive: No