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.