supply of set of gauges for screw couping , set of gauges for screw couping consist of following gauges (1) thread profil e ring gauge (go-01 no. & nogo-01 no.) requied size:m39 x 3mm (exteernal) wear limit-01mm re f. drg. no. rdso sk79063 alt-4 & sk99007 material - tool steel, is:3748/90 hardness-50/55 hrc, ( 2) thread profile gauge external (go & nogo) size-39 x 3mm (ring gauge) wear limit 0.5mm ref . drg. no. w/bd-353, material-tool steel/stainless steel & hardened, (3) gauge for trunion 76 mm thickness required size-nogo 72 mm (snap type) ref drg. no. rdso-sk-79068 alt-08 & sk-990 02 material ?tool steel, is:3748/90, hardness-50/55 hrc, (4) k-thread profile gauge (ring gaug e type) for screw. size-55 x 6.35mm- k/thread go & nogo gauge. wear limit 01 mm ref. drg. rds o sk-79068 alt-08 & sk-99002 material stainless steel & hardnened, (5) k-thread profile gaug e (plug gauge type) for trunion-lh/rh. size-55.635 x 6.35mm- d/thread go & nogo gauge wear l imit 01 mm ref. drg. no. rdso sk-79068 alt 8 & sk-99002 material-stainless steel & hardened, ( 6) feeler gauge required size-03mm, material tool steel, is:3748/90 hardness- 50/55 hrc [ war ranty period: 30 months after the date of delivery ] ]