uxcell TO-3PII MICA Transistor 25 x 20 x 0.15mm Insulation Pad Sheet 1000 Pcs Product Name : Mica Insulator;Fit for : TO-3PII MICA Transistor Material : Mica;Total Size : 25 x 20 x 0.2mm/ 1" x 0.8" x 0.008"(L*W*T) Hole Diameter : 3.5mm;Color : Clear Weight : 174g Package Content : 1000 Pcsx Mica Insulator