Metric 'Work Box Friend' is laser cut and engraved from perspex, it can be wiped clean and PVA (white tacky glue) does not stick to it. Neat and Compact, yet it has a glueing jig plus with metric measurements a rectangle rule with double sides, a right angle for marking and cutting, 12th, 24th, 48th and 144th scale rules plus a scale table for measurements and conversions - the metric workbox friend has full instructions and is 5.5 inches by 4 inches in size - so it easily fits into your workbox