HEAT BLOCK LID, for VP 416-ALB-20 and -30, 4.5mm Thick PEEK, 127.65mm Long and 85.48mm Wide, with 4 Counter Bore Holes for Attachment Bolts to Provide Sealing Mechanism. Includes Silicone Rubber Gasket, Assortment of 4/40 Bolts to Accommodate Vials of Different Heights