The SB Scriber is the same size as the FB Scriber apart from the width which is 19mm. Particularly useful for getting in tight spots when fitting furniture but equally at home levelling chair/table legs in the workshop after construction. With a shortened pencil this scriber fits in the palm of your hand and gives you great control. Once set up the scriber can be tightened with plenty of force so it doesn't move half way through a scribe. The hole for the pencil is 8mm.