Valve Lockouts 108 Small Ball Handle Valve Large Ball Handle Valve Extra Large Ball Handle Valve Specifications ML-S3922 ML-S3923 ML-S3924 Nut Diameter 19-28mm 33-47mm 52-69mm Shackle Diameter 7mm 7mm 7mm This lockout by Master Lock conceals and prevents access to nuts holding a blind in place. The lockout is built from durable aluminium and steel to ensure it will perform under harsh conditions. ] ] Fully conceals flange bolts preventing access to the blind until all work has been completed ] ] Four lockout holes allow for multiple workers to lockout device at one time Blind Flange Lockouts  HOW DOES IT WORK? Place the device ends over the nuts, once secured and tight, place a padlock through the padlock holes to prevent access to the pipeline/blind.