A pneumatic tool including: a casing unit having an air inlet passage ; an air motor mounted in said casing unit , and including a cylinder wall that surrounds a motor axis (L) and that defines an air chamber , said cylinder wall having first and second air ports that are in spatial communication with said air chamber ; and a rotary valve mounted to said air motor and rotatable about a valve axis (X), said rotary valve having an opening and an intermediate passage that spatially intercommunicates said opening with said air inlet passage of said casing unit ; wherein: said pneumatic tool further includes a turning unit including a ring member that surrounds and is rotatably mounted to said casing unit , said ring member being connected to said rotary valve , such that rotation of said ring member relative to said casing unit drives said rotary valve to rotate about the valve axis (X) relative to said air motor among a first-end position, where said opening is in spatial communication with said first air port and is clear of obstructions, a second-end position, where said opening is in spatial communication with said second air port and is clear of obstructions, and at least one in-between position, where said opening is in spatial communication with one of said first and second air ports and is partially blocked; characterized in that : the valve axis (X) is parallel to and spaced apart from the motor axis (L) and further said casing unit includes a front casing and a rear casing that are arranged along the motor axis (L); said rear casing further has a front end portion connected to said front casing ; and said ring member of said turning unit surrounds said front end portion and is disposed between said front and rear casings of said casing unit . a casing unit having an air inlet passage ; an air motor mounted in said casing unit , and including a cylinder wall that surrounds a motor axis (L) and that defines an air chamber , said cylinder wall having first and second air ports that are in spatial communication with said air chamber ; and a rotary valve mounted to said air motor and rotatable about a valve axis (X), said rotary valve having an opening and an intermediate passage that spatially intercommunicates said opening with said air inlet passage of said casing unit ; wherein: said pneumatic tool further includes a turning unit including a ring member that surrounds and is rotatably mounted to said casing unit , said ring member being connected to said rotary valve , such that rotation of said ring member relative to said casing unit drives said rotary valve to rotate about the valve axis (X) relative to said air motor among a first-end position, where said opening is in spatial communication with said first air port and is clear of obstructions, a second-end position, where said opening is in spatial communication with said second air port and is clear of obstructions, and at least one in-between position, where said opening is in spatial communication with one of said first and second air ports and is partially blocked; characterized in that : the valve axis (X) is parallel to and spaced apart from the motor axis (L) and further said casing unit includes a front casing and a rear casing that are arranged along the motor axis (L); said rear casing further has a front end portion connected to said front casing ; and said ring member of said turning unit surrounds said front end portion and is disposed between said front and rear casings of said casing unit . <EOS>