Each box contains 6pieces extended length automatic pencil refills, durability of standard refills for uninterrupted technical drawing The elongated refills tip maintains clearly visibility in drilling setups while fit most 2.8mm woodworking pencils mechanical drafting pencils Widely used for cabinetry joinery, mechanical blueprinting, woodworking drafting, and scale model drawing where traditional wood pencils cannot access confined spaces Suitable for professional engineers, architects, and craft enthusiasts requiring millimeter accuracy in detailed woodworking marking applications Engineered for precisely marking, this 2.8mm woodworking pencil refills features 12cm long that reaches narrow cavities in woodworking and engineering project