Helix Precision Thumb Wheel Compass (32577)<div style="text-align: left;"><strong>[Product Information]</strong><ul><li id="replacementPartsFitmentBullet" class="aok-hidden" data-doesntfitmessage="We're not sure this item fits your " data-fitsmessage="This fits your "><span class="a-list-item"><span id="replacementPartsFitmentBulletInner"><a href="#" class="a-link-normal hsx-rpp-fitment-focus">Enter your model number</a>to make sure this fits.</span></span></li><li><span class="a-list-item"> Metal construction for years of use </span></li><li><span class="a-list-item"> Adjustable knee joints for precise circles </span></li><li><span class="a-list-item"> Comes with replacement leads， screws and nuts </span></li><li><span class="a-list-item"> Metal construction for years of use ^Adjustable knee joints for precise circles ^Comes with replacement leads， screws and nuts </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41tolFTR8BL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/311kaR5-KDL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41XZEi9WK5L.jpg" noproxy>