ZDD Package IncludeYou will get 2 piece compasses(1 small and 1 large),1 piece extension beam,1 x Conversion head,1 x pencil refill,1 x pencil sharpener,1 piece compass and 1 piece shatterproof plastic box.This is a complete set. Extension Beam DesignOur large compass can draw a circle with a diameter of 29cm at most. If this size does not meet your requirements, our compass includes an extension beam,You can draw larger circle without lots of measuring and connect dots. Drawing AssistantBy turning the middle of the screw to adjust the opening and closing compass, can prevents unintentional leg movements, professional makes drawing easy and fun.high accuracy. MaterialThese compass set are made of all metal with nickel plating compass,durable and easy carry.unlike plastic compass math easy broken , can be use long time. Wide ApplicationIdeal for math classes, drafting, architectural drawings, engineering designs, both mechanical design and construction.These drafting compass set suitable for kids and adults , great for use in shool , woodworking ,workshop or home. Product details: Material: metal Size: as pictures shown Package contain: 2 x compasses(1 small and 1 large) 1 x extension beam 1 x Conversion head 1 x pencil refill 1 x pencil sharpener 1 piece compass 1 piece shatterproof plastic box