Architect Construction Tools: Package contains 36 pens.The replaceable pen core has a variety of colors to choose from, including black, yellow and red.A variety of quantities and colors can meet your different needs.2.0mm pens are suitable for mechanical carpentry pencils.2.8mm pens are suitable for deep hole working pencils.Whether you write on ordinary wood or smooth paper, pencils can be written easily and clearly.Sometimes we need to pass through a small hole to mark, and it is difficult to penetrate the tip of ordinary pencils.Our products can help you solve the problem well.The folder design allows you to carry a pencil anytime, anywhere, portable and easy to use. The intimate anti-slip design allows you to hold the pen comfortably while focusing on work.The length of the deep hole working pencil can reach 45mm, which is suitable for marking holes or other narrow areas.