This lock is a cheap masterlock but suprisingly well made core . It is 6 pins full of security pins . It was difficult to pick but for $ 8 it was very good . I didn ' t take it apart but it seemed spool heavy but if feel like there are some serrated pins . I ' m relatively new to lock picking myself . If you wanted to take the plastic shell apart I am sure you could play with the pinning and use a vice grip to pick it . Master Lock 410 GRN Green 410 Zenex Safety Padlock with Short Body , 14 x 112 Shackle Pack of 1 cmswrapaGuTnybCX 0 JS 8 V <| sep |> The guest service fee is 612 % of the base price which includes the nightly rate x # of nights plus the cleaning fee if any . The higher the base price the lower the service fee .