ITEM NAME:TO-220 Transistors Aluminum Heat Sink Cooling Circuit Board with Storage Box Description: 3 types heatsinks,each size 10Pcs,15*10*17mm/15*10*21mm/15*7*17mm 30 TO-220 Insulated Particle, 30 To-220 Insulating Sheet, 30 M3 Screws Uses: Motherboard Transistor heat sink U-shaped design saves space, comprehensive veneer IC cooling material: metal Package Includes: 1Pack Transistor heat sink kit SKU: DMO0011809563019108.Uses: Motherboard Transistor heat sink. U-shaped design saves space, comprehensive veneer IC cooling.