This is Brand New OEM Poulan Chainsaw Chain Tensioner Assembly. Part #530069611. The picture can describe this item better than I can.

Compatibility:

1900	1950 Type 1	1950 Type 2	1950 Type 3	1950 Type 4
1950 Type 5	1950 Type 6	1950 Type 7	1950LE Type 1	1950LE Type 2
1975 Type 1	1975 Type 2	1975 Type 3	1975 Type 4	1975 Type 5
1975 Type 6	1975 Type 7	1975LE Type 1	1975LE Type 2	2025
2050 Type 1	2050 Type 2	2050 Type 3	2050 Type 4	2050 Type 5
2050 Type 6	2050 Type 7	2050LE Type 1	2050LE Type 2	2050WT Type 1
2050WT Type 2	2050WT Type 3	2050WT Type 4	2050WT Type 5	2050WT Type 6
2050WT Type 7	2055 Type 1	2055 Type 2	2055 Type 3	2055 Type 4
2055 Type 5	2055 Type 6	2055 Type 7	2055LE Type 1	2055LE Type 2
2075 LE Gas Chain Saw	2075 Type 1	2075 Type 2	2075 Type 3	2075 Type 4
2075 Type 5	2075C Gas Chain Saw Type 1	2075C Gas Chain Saw Type 2	2075C Gas Chain Saw Type 3	2075C Gas Chain Saw Type 4
2075C Gas Chain Saw Type 5	2075OC Gas Chain Saw Type 1	2075OC Gas Chain Saw Type 2	2075OC Gas Chain Saw Type 3	2075OC Gas Chain Saw Type 4
2075OC Gas Chain Saw Type 5	2150 Predator Type 1	2150 Predator Type 2	2150 Predator Type 3	2150 Predator Type 4
2150 Predator Type 5	2150 Predator Type 6	2150 Type 1	2150 Type 2	2150 Type 3
2150 Type 4	2150 Type 5	2150 Type 6	2150 Type 7	2150LE Predator Type 1
2150LE Predator Type 2	2150LE Type 1	2150LE Type 2	2155 Type 1	2155 Type 2
2155 Type 3	2155 Type 4	2155 Type 5	2175 Type 1	2175 Type 2
2175 Type 3	2175 Type 4	2175 Type 5	2175 Type 6	2175 Type 7
2175LE	2250 Type 1	2250 Type 2	2250 Type 3	2250 Type 4
2250 Type 5	2250 Type 6	2250 Type 7	2250LE Type 1	2250LE Type 2
2350	2375 Type 1	2375 Type 2	2375 Type 3	2375 Type 4
2375 Type 5	2375 Type 6	2375 Type 7	2375LE Type 1	2375LE Type 2
2450 Type 1	2450 Type 2	2450 Type 3	2450 Type 4	2450 Type 5
2450 Type 6	2450 Type 7	2550 Type 1	2550 Type 2	2550 Type 3
2550 Type 4	2550 Type 5	2550 Type 6	2550 Type 7	2550LE Type 1
2550LE Type 2	2550SE Type 1	2550SE Type 2	2550T	2555 FLW
2775 Type 1	2775 Type 2	2775 Type 3	2775 Type 4	2900 Type 1
2900 Type 2	2900 Type 3	810	BH2160	BH2160LE
P3314 Type 1	P3314 Type 2	P3314WS Type 1	P3314WS Type 2	P3314WSA Type 1
P3314WSA Type 2	P3416 Type 1	P3416 Type 2	P3516PR Type 1	P3516PR Type 2
P3818AV Type 1	P3818AV Type 2	P4018	P4018AV Type 1	P4018AV Type 2
P4018AV-BH Type 1	P4018AV-BH Type 2	P4018WM Type 1	P4018WM Type 2	P4018WT Type 1
P4018WT Type 2	PP210	PP4218AVHD Type 2	PP5000P	PPB3416 Type 2
PPB4018 Type 2	S1970 Type 1	S1970 Type 2	SM4018