the claw jaw in curved tooth 240 for example the left curved edge 250 of the tooth top surface 235 is formed by the intersection of the tooth top surface 235 with the curved tooth left surface 237 and the right curved edge 252 of the tooth top surface 235 is formed by the intersection of the tooth top surface 235 with the curved tooth left surface 238 the tooth bottom surface 236 is angular but flat in the pyramid model the surface area of the tooth top surface 235 is less than or equal to the surface area of the tooth bottom surface 236 the apex 234 of each tooth is the point of intersection of the bottom and top angular surfaces and left and right curved edges of the tooth the apex 234 is closer to the top 106 of the claw jaw than to the step floor 231 although not shown in fig1 an undercut web is found at the intersection between adjacent teeth for example at the intersection between the right surface 238 of tooth 240 and left surface 237 of tooth 241 the undercut web between the curved teeth is similar to the undercut relief 239 depicted in fig9.