LEGO set 30312, titled "Demolition Driller," is a miniature construction vehicle, now retired.  It includes a demolition driller with a working drill and a construction worker minifigure. The set, released in 2015, is part of the LEGO City theme and is known for being a polybag set, meaning it comes in a single plastic bag. It's designed for ages 5 and up and contains 40 pieces, according to multiple online retailers. 
 
Key features of the set:
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Demolition Driller:The vehicle has a drill that can be extended and angled, and it also includes a saw attachment.
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Construction Worker Minifigure:The set comes with a minifigure wearing orange workwear and a construction helmet.
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Playability:The driller's arm can be manipulated for different demolition tasks, and the set integrates well with other LEGO City sets, particularly those with a construction theme.
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Building Instructions:Building instructions are readily available online.
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Retired Set:LEGO 30312 is a retired set, making it potentially more sought-after by collectors.