Tamiya 74139 Engraving Blade Holder. This is a lightweight, ergonomically designed holder for Tamiya’s line-up of Fine Engraving Blades. (Items 74135-38). Engraving Blade Holder x1, Length: 126mm, diameter: 6mm. Made from lightweight, durable aluminum, with a knurled grip section for error-free crafting. The chuck is made of nickel-plated brass. The holder’s slimline form allows it to be held like a pen. Blade insertion and removal is simple – just lightly pinch the chuck and rotate the handle. Comes with a protective cap that also stops the holder from rolling away. Compatible with Fine Engraving Blades (Items 74135-38) and Design Knife Blades (Item 74074).