The MAREDO Greensmower Vibe Recip-Corer utilizes vertical coring tines, with hole spacing determined by working speed. Up to 36 holes per sq. ft. ( 1,200 per sq. mtr.) are possible. Working depth up to 1" (25 mm). A core collector collects the cores. Solid needle tines (3/16"/5 mm) can also be fitted to the GT-230.