Pentel GraphGear 1000 Mechanical Pencil, (0.5mm) - Black has great 4.7 rating out of 5.0.
Chiseled metallic grip inlaid with soft latex-free pads provides writing comfort
Dual-action retractor advances and retracts tip for easy use
Superior drafting pencil for general and technical writing
Refillable with Pentel Super Hi-Polymer Lead and Z2-1 eraser