Set of one Hex. Head Bolt full threaded along with suitable one Nut, one Flat washer, one Spring washer for Air flow relays & Relay meters. Set consisting of 11 different sizes ( Each size having 01 Bolt, 01 Nut, 01 Flat/ w & 01 Spring/ w must be supplied ) as per enclosed attachment. Makes: Unbrako/ TVS/ BMI/ DFL/ VIF/ PFL. Note: One sample set of each size should be got approved before effecting bulk supply.