This Tracer AMK4 Deep Hole Pencil Kit is ideal for marking ceramics, plastic, wood, and metal. It includes a Deep Hole Construction Pencil with an inbuilt sharpener for precision, replacement leads, and two clog-free permanent markers in black and red, all supplied with holsters. The pencil can mark up to 100mm deep in a 3mm wide hole and up to 145mm deep in a 6mm wide hole. The complete set includes 1x TRACER Deep Hole Pencil with site holster, 4x Graphite replacement leads and 2x alternative yellow leads in an anti-snap dispenser, and 2x all-purpose clog free markers in black and red with site holsters.