Well Made & More Accurate:The refills are made of solid lead, when you mark a line the lead wont break ,sturdy and durable,and slimmer refill is more accurate than the larger flat carpenter pencils Deep Hole Design: The metal rod of mechanical construction pencil is 42mm/1.65, Which can pass through most holes for marking or unreachable place with a regular flat carpenter pencil Built-in Pencil Sharpener: The cap of the woodworking pencil is a built-in sharpener,it is handy to sharpen pencil,it will save your time sharpening pencils and you can clip it to your trousers Wide Application:There are 3 colors refills:black, red,yellow,they can use on the wood, metal, concrete floor, wall.. yellow refills allows you to see your markings accurately on stainless steel What You Can Get:The package comes with 1pcs red carpenter mechanical pencil and 1pcs black carpenter pencil with pre-filled black refills and 2 boxes of refills:there are 6pcs black refills ,3pcs red refills and 3pcs yellow refills