Susa Seisakusho Tonkachi Maru Genno Japanese Hammer is very much a do it all tool, from driving nails to striking chisels (hence the iron hoop on the top of Japanese chisels). One face is flat, this is for driving nails and striking chisels, the other face is slightly crowned, used mainly for the final blow to the nail head thus driving it flush without damaging the surrounding surface. In construction these hammers have laminated heads with hard steel faces forged onto a softer steel centre. Long slim white oak handles give an overall feel of great delicacy and full control. Like all traditional Japanese tools, they are left slightly unfinished (just as the chisels require final fitting of the hoop). It has head weight of 375 g.