LEGO Arm Skeleton (6265) has been used in at least 69 Lego sets over the past 18 years, since it was first used in 1995. This part can be most commonly found in Castle sets where it has been included 16 times. You are most likely to find this Lego part in White, but keep an eye out for it in Black which is the rarest colour, only being found in 1 set.
LEGO Skeleton, Arm Colour List
|Lego Colour||Lego Item Number|