Hellermann tyton sleeve fitting tool and k tool 3 pronged expanding pliers hellermann tyton k sleeve fitting tool the hellermann tyton 621 80007 k tool is a three pronged expanding tool that is used to ensure speedy application of sleeves and grommets between 5mm and 10mm diameter for easy operation use hellerine lubricant ideal for product family k s and ss hellermanntyton k sleeve fitting tool 621 80007 3 pronged expanding pliers