NEW Scionon Base Grafting Unit SGC6-GBU The modular base unit allows novices to achieve high quality bench grafting. Whip and tongue or simple grafting can be carried out accurately and with minimal damage to the cambium layers. Can be used to graft rootstocks and scions ranging from 5 mm to 15 mm. Delivery includes: A guide block, the tongue splitter block plus 2 extra blades.