Hello everyone i have this problem

i have a table like this

id   sequence  phase  characteristics
1      1        300      001
2      1        300      001
2      2        300      002
..

and another table that contain a lot of characteristics for each phase

phase  characteristics
300      003
300      004
300      005
....

i need to add all the characteristics to each id/sequence where phase is 300

for better understanding what i need is

id   sequence  phase  characteristics
1      1        300      001
1      1        300      003
1      1        300      004
1      1        300      005
2      1        300      001
2      1        300      003
2      1        300      004
2      1        300      005
2      2        300      002
2      2        300      003
2      2        300      004
2      2        300      005
..

I have attempted several solutions, but I am not proficient in SQL. Could someone please offer assistance? Thank you in advance