A chalk line or chalk box is a tool for marking long, straight lines on relatively flat surfaces, much farther than is practical by hand or with a straightedge.

It is an important tool in construction and carpentry, the working of timber in a rough and unplaned state, as it does not require the timber to have a straight or squared edge formed onto it beforehand.

A chalk line draws straight lines by the action of a taut nylon or similar string. Specifically, the string (previously impregnated or coated with a loose dye such as chalk) is laid across the surface to be marked and pulled tight. The string is then plucked or snapped sharply to cause the string to strike the surface, transferring the chalk to the surface along that straight line. Chalk lines can also be used across surfaces with holes in them, for example on an unfinished stud wall. As long as the line is taut and the two ends of the chalk line are in the same plane, the chalk line will mark all points on that plane that it touches once snapped.

Tauheed Epps (born September 12, 1976), better known by his stage name 2 Chainz, formerly known as Tity Boi, is an American rapper from College Park, Georgia. He was previously signed to Ludacris' record label Disturbing tha Peace with Dolla Boy as Playaz Circle.

2 Chainz was born Tauheed Epps on September 12, 1976. He was originally known under the name "Tity Boi", a name given to him by his mother, as Epps was an only child and thus the only one his mother would breastfeed. Further research and investigation showed that he had one brother named Dimatri who was 9 months younger than him and adopted by a couple in Birmingham, Alabama. His brother has one daughter named Sakia and one son named Dimatri Jr. nicknamed, DJ. His niece, Sakia is 13 (2011) and his nephew, DJ is 2 (2011). His niece is very proud of her uncle and talks to him alot on the phone. She also loves to visit him on her breaks.

His graduating record in college was a 4.0

Epps formed the hip hop duo Playaz Circle (the word "Playaz" being an acronym of Preparing Legal Assets for Years from A to Z) in College Park, Georgia in 1997 with his high school friend Earl Conyers, who became known under his recording name Dolla Boy. Following the release on an independent album titled United We Stand, United We Fall, the duo were introduced to fellow rapper Ludacris when he moved into their College Park apartment complex whilst he was acting as a disc jockey: after he took an interest in Playaz Circle, he began to record several songs with the group, playing some of them on his radio station.