Gunson 77147 Classic Wooden Handle Screwdriver - Flat 10mm x 250mm Gunson 77147 Classic Wooden Handle Screwdriver - Flat 10mm x 250mm Gunson 77147 Classic Wooden Handle Screwdriver - Flat 10mm x 250mm Classic wooden handle screwdriver for the Classic toolbox. Flat tip: 10mm x 250mm long. Blade manufactured from heat treated IC55 Steel. Other sizes available 9.0mm (77145), 9.5mm (77146), 10.5mm (77148). Gunson - Tools for the Classic Enthusiast. This product has no reviews yet, however see what our buyers say about our other products... This product has no reviews yet, however see what our buyers say about our other products... DIY Car Service Parts has now added a dedicated sales and distribution team to handle customers questions and pre-sales enquires, we are experts in our field so if.