The contents of the spares kit are used to service and maintain your optical cryostat to ensure optimal performance. Contents of kit: 12 SCREW A4ST C/SK M02.5 X 005, 6 SCREW A4ST CAP M02.5 X 010 SET, 8 SCREW BR C/SK M01.6 X 003, 1 O RING R03262 BS146 NBR 70 SH, 1 O RING R03275 BS148 NBR 70 SH, 2 O RING R02056 BS015 NBR 70 SH, 1 QUADRING 4112 BUNA N 12.37ID, 1 O RING R02050 BS014 NBR 70 SH,
1 O RING 0.437 X 0.070 60 SHORE, 1 O RING 0.500 X 0.103 BS112 VIT, 6 WASHER NYLON FLAT M02.5,